Abstract Details
| Name: Lokesh Kumar Dewangan Affiliation: Physical Research Laboratory Conference ID: ASI2016_522 Title : A multi-scale, multi-wavelength study of massive star-forming region W42 Authors and Co-Authors : Dewangan, L. K. (PRL, India), Mayya, Y. D. (INAOE, Mexico), Luna, A. (INAOE, Mexico) , and Ojha, D. K. (TIFR, Mumbai) Abstract Type : Oral Abstract Category : Stars, The Milky Way Galaxy and its neighbours Abstract : The identification of jet associated with a critical early phase of an individual O-type star is extremely rare phenomenon in massive star formation research. In the literature, there are only a handful of massive young stellar objects known to be associated with highly collimated jets and/or Herbig-Haro objects. We will present results of an analysis of massive star-forming region W42 using a multi-scale and multi-wavelength approach. These results throw light on the physical environment of W42 on smaller (about 5000 AU) and larger (about several pc) scales, helping to understand the formation of massive stars. In this region, we have discovered a parsec scale H2 outflow that is driven by an infrared counterpart of the 6.7-GHz methanol maser emission (i.e. W42-MME; stellar mass 19 solar mass and extinction 48 mag). Furthermore, we have investigated a collimated jet-like feature (in the inner 4500 AU) in W42-MME using the VLT near-infrared adaptive-optics images. The jet is located inside an envelope/cavity (extent ~10,640 AU) that is tapered at both ends and is oriented along the north-south direction. Such observed morphology of the outflow cavity around the massive star is scarcely known and is very crucial for understanding the jet-outflow formation process in massive star formation. |